Process for the gas-phase polymerization of olefins

Details Process for the gas-phase polymerization of olefins Process for the gas-phase polymerization of olefins

1993-03-12

1998-03-31

Weber, Thomas R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in two or more physically distinct zones

526 88, 526901, 526 75, C08F 234

Patent

active

057339872

ABSTRACT:
Process for the gas-phase polymerization of ethylene and ethylene mixtures with .alpha.-olefins CH.sub.2 .dbd.CHR in the presence of a high activity catalyst comprising a titanium compound containing at least one Ti-halogen bond, supported on magnesium dichloride in active form said process comprising the steps of: (a) contacting the catalyst component; (b) prepolymerizing ethylene or ethylene mixtures with .alpha.-olefins in order to produce a polymer amount of from approximately 5 g per g of solid component, up to an amount corresponding to about 10% of the final catalyst yield; (c) polymerizing ethylene or ethylene mixtures with .alpha.-olefins in the gas-phase, in the presence of the prepolymer-catalyst system obtained in (b), while maintaining in the gas phase a molar concentration concentration of the alkane comprised between 20 and 90% with respect to the total gases.

REFERENCES:
patent: 3954909 (1976-05-01), Havas et al.
patent: 4128607 (1978-12-01), Shiomura et al.
patent: 4298713 (1981-11-01), Morita et al.
patent: 4525547 (1985-06-01), Kato et al.
patent: 5241023 (1993-08-01), Brule et al.
EPO Search Report (with Annex), dated Jul. 6, 1993.

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